Konwersja kodu z Pythona na Java - sprawdzenie

#!/usr/bin/python

import smbus
import time

# Define some device parameters
I2C_ADDR = 0x3f  # I2C device address
LCD_WIDTH = 16  # Maximum characters per line

# Define some device constants
LCD_CHR = 1  # Mode - Sending data
LCD_CMD = 0  # Mode - Sending command

LCD_LINE_1 = 0x80  # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0  # LCD RAM address for the 2nd line
LCD_LINE_3 = 0x94  # LCD RAM address for the 3rd line
LCD_LINE_4 = 0xD4  # LCD RAM address for the 4th line

LCD_BACKLIGHT = 0x08  # On
# LCD_BACKLIGHT = 0x00  # Off

ENABLE = 0b00000100  # Enable bit

# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005

# Open I2C interface
# bus = smbus.SMBus(0)  # Rev 1 Pi uses 0
bus = smbus.SMBus(1)  # Rev 2 Pi uses 1


def lcd_init():
    # Initialise display
    lcd_byte(0x33, LCD_CMD)  # 110011 Initialise
    lcd_byte(0x32, LCD_CMD)  # 110010 Initialise
    lcd_byte(0x06, LCD_CMD)  # 000110 Cursor move direction
    lcd_byte(0x0C, LCD_CMD)  # 001100 Display On,Cursor Off, Blink Off
    lcd_byte(0x28, LCD_CMD)  # 101000 Data length, number of lines, font size
    lcd_byte(0x01, LCD_CMD)  # 000001 Clear display
    time.sleep(E_DELAY)


def lcd_byte(bits, mode):
    # Send byte to data pins
    # bits = the data
    # mode = 1 for data
    #        0 for command

    bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT
    bits_low = mode | ((bits << 4) & 0xF0) | LCD_BACKLIGHT

    # High bits
    bus.write_byte(I2C_ADDR, bits_high)
    lcd_toggle_enable(bits_high)

    # Low bits
    bus.write_byte(I2C_ADDR, bits_low)
    lcd_toggle_enable(bits_low)


def lcd_toggle_enable(bits):
    # Toggle enable
    time.sleep(E_DELAY)
    bus.write_byte(I2C_ADDR, (bits | ENABLE))
    time.sleep(E_PULSE)
    bus.write_byte(I2C_ADDR, (bits & ~ENABLE))
    time.sleep(E_DELAY)


def lcd_string(message, line):
    # Send string to display

    message = message.ljust(LCD_WIDTH, " ")

    lcd_byte(line, LCD_CMD)

    for i in range(LCD_WIDTH):
        lcd_byte(ord(message[i]), LCD_CHR)


def main():
    # Main program block

    # Initialise display
    lcd_init()

    while True:
        # Send some test
        lcd_string("RPiSpy         <", LCD_LINE_1)
        lcd_string("I2C LCD        <", LCD_LINE_2)

        time.sleep(3)

        # Send some more text
        lcd_string(">         RPiSpy", LCD_LINE_1)
        lcd_string(">        I2C LCD", LCD_LINE_2)

        time.sleep(3)


if __name__ == '__main__':

    try:
        main()
    except KeyboardInterrupt:
        pass
    finally:
        lcd_byte(0x01, LCD_CMD)

package com.burdzi0;

import com.pi4j.io.i2c.I2CBus;
import com.pi4j.io.i2c.I2CDevice;
import com.pi4j.io.i2c.I2CFactory;
import com.pi4j.io.i2c.I2CFactoryProviderRaspberry;
import com.sun.org.apache.bcel.internal.generic.I2C;

import java.io.IOException;

public class LCDController {

    int I2C_ADDR = 0x3f;
    int LCD_WIDTH = 16;

    int LCD_CHR = 1;
    int LCD_CMD = 0;

    int LCD_LINE_1 = 0x80;
    int LCD_LINE_2 = 0xC0;

    int LCD_BACKLIGHT_ON = 0x08;
    int LCD_BACKLIGHT_OFF = 0x00;

    int ENABLE = 0b00000100;

    int E_PULSE = 5;
    int E_DELAY = 5;

    I2CBus bus;
    I2CDevice dev;

    public LCDController() throws IOException, InterruptedException {
        bus = I2CFactory.getInstance(I2CBus.BUS_1);
        dev = bus.getDevice(I2C_ADDR);
        init();
    }

    void init() throws InterruptedException, IOException {
        lcd_byte(0x33, LCD_CMD);
        lcd_byte(0x32, LCD_CMD);
        lcd_byte(0x06, LCD_CMD);
        lcd_byte(0x0C, LCD_CMD);
        lcd_byte(0x28, LCD_CMD);
        lcd_byte(0x01, LCD_CMD);
        Thread.sleep(E_DELAY);
    }

    void lcd_byte(int bits, int mode) throws IOException, InterruptedException {
        int bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT_ON;
        int bits_low = mode | ((bits << 4) & 0xF0) | LCD_BACKLIGHT_ON;

        dev.write(I2C_ADDR, (byte) bits_high);
        lcd_toggle_enable((byte) bits_high);

        dev.write(I2C_ADDR, (byte) bits_low);
        lcd_toggle_enable((byte) bits_low);
    }

    void lcd_toggle_enable(byte bits) throws InterruptedException, IOException {
        Thread.sleep(E_DELAY);
        dev.write(I2C_ADDR, (byte) (bits | ENABLE));
        Thread.sleep(E_PULSE);
        dev.write(I2C_ADDR, (byte) (bits & ~ENABLE));
        Thread.sleep(E_DELAY);
    }

    void lcd_string(String message, int line) throws IOException, InterruptedException {
        lcd_byte(line, LCD_CMD);
        for (int i = 0; i < LCD_WIDTH; i++) {
            lcd_byte(message.charAt(i), LCD_CHR);
        }
    }

    public static void main(String[] args) {
        LCDController lcd = null;
        try {
            lcd = new LCDController();
            lcd.init();
            while (true) {
                lcd.lcd_string("RPiSpy         <", lcd.LCD_LINE_1);
                lcd.lcd_string("I2C LCD        <", lcd.LCD_LINE_2);
                Thread.sleep(3000);
                lcd.lcd_string(">         RPiSpy", lcd.LCD_LINE_1);
                lcd.lcd_string(">        I2C LCD", lcd.LCD_LINE_2);
                Thread.sleep(3000);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            try {
                lcd.lcd_byte(0x01, lcd.LCD_CMD);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}